#include "Arduino.h"

void setup(void)
{

    Serial.begin(115200,SERIAL_8N1,6,7);
    Serial1.begin(115200,SERIAL_8N1,15,16);
    Serial2.begin(115200,SERIAL_8N1,17,18);

}


void loop()
{
    Serial2.printf("uart 2\n");
    Serial1.printf("uart 1\n");
    Serial0.printf("uart 0\n");
  delay(1000);
}